Artificial arm



1,469,431 A. E. ARNAL I v ARTIFICIAL ARM Filed Aug. 17'. 1920 2 Sheets -Sheet 1 Oct. 2 1923.

A. E. ARNAL ARTIFICIAL ARM Filed Aug. 17. 1920 2 Sheets-Sheet 2 Patented get. 2, 1923,

ALBERT EMILE ARNAnor PARIS, relation: a f

ARTIFI IAL ARM.

Application filed August 17, 1920; serial'ite. ioaoegij To aZZ whom z't may concern:

and articulation of its various members in i such manner as to enable the wearer to carry or the'hook.

out all the movements. efiec'ted by the .naituralarm and to secure in position and oper ate Wltliit tool engaged in a suitable device mounted at the end of the arm' and consti tuting the artificial hand mechanism.

To 7 this, effect, the device comprises a framework constituting the forearm and having secured theretothe tool holder the said framework being pivoted to a forked member carrying aleather band whereby the artificial arm is secured to the stump.

The articulation is disposed. in such manner as tovary' the angular position of the parts thereof as .desired or to bring the same into alignment while thefdevic-e connectingthe' arm with the' forea-rm' provides for the rotation of the latter in such manner as to plaee'the. tool in any'desired position; The various parts are held in place by look ing devices which can be instantly engaged or released. by a simple pre'ssureupon the vices. V v I This invention is represented by' wayo f example in the accompanying drawings.

Fig. 1 is aperspective .view ofthe artificial'arm. V p v 'j i F ig. 2 is a like view with the arm folded back.

actuating member of the said 'locking de- (Fig. 3 is a separate perspectivevi'ew of the hook which is adapted to be secured tof the forearm. p I I I F 4is a'separate vertical section of the device forming a support forthe tool holder Fig. 5 .is afcrosis section'of the device' shown inlFig, 4;

Fig.6 is an enlarged fragmentary bottom plan-viewer the artificialarm, partly in 'sec- 1 tion showing certain of the lockin V p I g devices for the pivoted partsindetaih Fig. 7 is a vertical section of thesam'e;

As observed in Figs. 1. and- 2, the appa-" V ratus'is constituted forked member 1 f7, and in this mannerthe whose branchesare riveted to a leather Qadapt'ed to receive the stump therein, and which is held by means of straps'or any other Y suitable fastening members. To the outer side" of the disk shapedbase3 of the forked men'iej her This secured by means of a bolt and lock nut 4:, a second or intermediateforkshaped member. 5. having between the branches thereof abrac ket 6. "The bolt-4 provides a" pivotal connection between the members/1 and 5 and the medial part 'of tl1e bracketf6 contains a socket 7 having slidabletherein' a rod 8 connected to a locl'ring'member'whos'ej i end is formedfby the pinQ sIidable inthe base'off the' forked memberfi. The pinf9 is engageable inany one of thecircularseries fof apertures '10 in the'disk'3f Theli'od '8 is actuated a coiled spring 11 mounted on the said rod and contained'within'the socket Pin is-constantly engaged w th one of the aperturesIO. f.

In order to cause the forearnr'to pivot about the, bolt 4 all. that is required'is to I eiiert a pressure upon; the head olf the' rod 8, thus causing the rod to draw ba'ck the pin" I 9 and to disengage the same from the set of J apertures 10. This rotation can be carried.

. out thr'ough an angle of-ZISO To maintain the forearm in'the position desired, the rod 8Iis released, and the action of the spring 11 will cause the pin 9 to again engage the correspondingaperture the S i s and will thus secure theforearmin place. Theends of the-branches of the intermediate forked member dare erase connected by a forked member. 5

0 Y shaft 12 having pivotally-mounted thereon f f quired position by; a locking device which is f similar tat-119.01 9 employedffori tlie disk: 31 The -end- 13 ofeach' 'supportfll is provided with a circular series of apertures 15 having engaging therein the'pinfjo f each of the locking members 15 secured to the'independently movable rods l6'slidable in thefbrai ches or Y the forked member 5 and"normally*pressed' apart. by a SPringfilT (Fig. 7-) whereby maintain the pins of the locking members. 15

10a in the apertureslfi ,Tobend backthe forearm upon th e arm orftoi'carryout thecon-f senee tl e p e of' h e k ammbe lea.

"trary 'rnovement, all that: is required -is toi-f pressupon the head's'of'both rods *16 which 5 thus releasing the ends 13 and allowing the thehooln- The hook is completely secured supportsi llto' pivot about 't hefshatt '12 a'tan imposition :bvbrin'gingr cloivnf th e rod; 26 in angle varying from O'to 185; such "manner as to "engage the middle groove As hereinloefore mentioned, it suffices "to" 2915f the stem of the hook whereby the latter the pins of the locking devices 15, under the i said slot. I I I action of the spring 17, will again engage-- Inbr-der tohvary'the positionof the'h'ook the apertures of the ends 13, thus securing. 530 it is disengaged at its polygonal end-30 the forearm in the desired 'p'ositin. A rod by swinging theloliing member 232 on its lB issecured to thesupports 16k and coming. pivot and turned until the desired position-7 against2a-fshoulderJB 'Oirqthe.ends oft-the has been obtained, the docking jmemloer is branches of the.forked lnieniher-fi serves :to then brought'back' to -its original clamping II limit the angular movementrofi the supports position] The nunibenof faces upon theiend Mlfin-the-.extreine positionof the same. I may var v-aocordingto the numherofdi'f;

cured acanal 9 havingpivoted thereto ahookl the hook. I v f j I('F.i g. 3) or a t ool /hol-der l?ii: serving It will be understood i'frorn the preceding the purpose ofithehandi-i Vilithin' the said thatlathe artificial arm thus constitutedfwill cap 'is seoiired aorosslpieee21f provided-with. answer all the .purposesof the-natural arms i 5 release the heads ofthe ro'ds l6, whereupeniu-isxprevented;lfr'onnzm oving upwardly in the i theoppositeendiof thesupports ll lis seferent positions Which'it is desiredztogive tow i 20 a dependiiigbracket21havingpivoted therefor. .Whichit is substituted when it issecjured'l to a ollarxlocking rneniher-22ior ningqaart to-the stump. {It forms a light and; strong sofethe rod' 23ahaving the headJ/l lthereof! device as a Whole, and thepivotinglandat}. submitted to:the'=-a ction of fifililfllngfi d dis: taching niembersare operated in a very con v V posechawithin this ohms. The rod 23 is venient' manner; theuse of the hookf oritliell adaptedito-iniovewithina longitudinal: slot tool holder which are adapted-to the endofl "25: formed the np oerapart the cap;19: the device will allow the' wearer to'perform and the-head of .theisaid rod bears against manual labor ofthe most variedIkinds With-1 theiedgesiof.thesgroove25 vhereinzit rise or out-iatigue:

V stantly inaintainedibylthepressure:ofthe; Having thus describedithe nature spring 24-; In fr ontlof the. cross piece and said inventionand the best means Iknowlof Withinthe cap lQ is pivoted a secondrodfld carrying the same zinto practical7efiectj I adapted to move ithin-a groove 27,- the claim: i I I I .l I head thereof beinggspring actuatod in the L In an artifioiah arm, a mernher 'attach-r. a same .manneras thehead of thelrodl23i able roaaump; a cup: "shaped member car- 7 whereby *it is held against thecap :19. A ried bvtherfirst: menti onecl ine1nber-,-\ahook 10d bayonet slot-28 in tl eend of the can 19 providedivitha polygonal eXtr'emity adaptserves :as a guide'and a seat for the hook 20; ed for insertion in the oupshaped member; The rear end of thehooklis provided with and means coacting xvitli the polvgonalgex I three groove's 2-9 and .ends in a"hexag onal trernity of the hook to'inaintain thelatt e rfin portion 30, the grooves: and the hexagonal various-angular positions wi-th' respect to tlieil l -portioniare empl'oyed'toseoure th e -saidhook .ciipf'shaped .rnemher. '7 i r inv the oap lS) as Will-be furtheiiset forth .2. In :anartificial arm, a membemaaeh;

Tea-insert then-hook 20=iinnplaeeia rnovevalole to a stump a cup-shaped inemloer oar-L I Inentis given to the-rod 23 in'the direction riedlloy the' first mentioned menibenia hook I of theja rrovvi (Fig. by drawingsiponthe provigiled'withia polygonal extreinitjadapthead-thereof; this rod beingintegrah with ed -for insertion in the cupishaped member, the-looking memberx22 'ivhereupon this lat means co-a'cting Withthe polygonal extreme ter Will be moved down vardly Then the ity of thehook to maintainatherlatter rin v second rod 26 is moved-upwardly in the various 7 angular positions with res'oecta-tm V groove??? inorder to permit tliefree insers the cuoshaped member, the shank otJsaicl tionzofv the-stem ofthe hook20: Whichis-in hook being provided with".'grooves,andi sertedrinwide end'of [the bayonet-slot 28; means co acting with 'said "groovestofmain At :this emollient, at, downward ,pressure is tain the 'hookin position .invthe cup jslia-ned I exerted'upon :t he :hooklwhereby it is caused member: y l V I 55 to eooperate by-itsfltwo end:grooves29 re: '3. In an artificial arm,a terminalinenrbe-r, 'spectively wlllhvthe restricted lower portion a hook inelu'dingn shankprovided with a of the, slot game witha .reoessin: thesaid plurality of grooves engageable Withivarious cross member-211 (To, hold thesaid'ihookin portions of the.terniin-almernber wherebjt to V place -itnwillrthen .sufiiee to zloringrbacksthe liinit relative longitudinalmovement-of the 50 said slockingmeinher by restoring the rod 23 hook -and terminal heinberyand aneansion tootherin tial position thus ":causing the maintaining the 'groovedj lportionsr of l th lygonalznendg portion 30 to engagegimanhook shank-';-iIihoperativelengageinentQwithf 'opeI-ring; ;23% provided linmtheilsaid pivoted portions of thewtenninalc mernhen;T

' .lockiing neinbengthelrfialtisidesaof lthis end k ln-an artifi rallarrn; aterI iiiallhiemhr I at 7 portion preventing all'rot-arymovernentof a hookprovided ivithff'poly gonal extremities 13o insertable in'said terminal member, means preventing displacement of the hook relative to the terminal member, and means carried by the terminal member engageable with the polygonal extremities of the hook shank to prevent turning of the latter.

5. In an artificial arm, a terminal member, a hook provided with polygonal extremities insertable in said terminal member, means preventing dlsplaceme-nt of the hook relative to the terminalmemberj and means carried by the terminal member engageable with the polygonal extremities of the hook shank toprevent tnrning of the latter, the

last mentioned means being mounted for, movement relative to the hooked shank In testimony, that I claim the foregoing as my invention, I have signed my name in presence of two subscribing witnesses. l

, VALBERT EMILEARNAL.

Witnesses: Y

HENRI EmnIsY, CLEMENT S. EDW RDS. 

